//
// Copyright (C) 2006 United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration
// (NASA).  All Rights Reserved.
// 
// This software is distributed under the NASA Open Source Agreement
// (NOSA), version 1.3.  The NOSA has been approved by the Open Source
// Initiative.  See the file NOSA-1.3-JPF at the top of the distribution
// directory tree for the complete NOSA document.
// 
// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
//
package java.security;

import java.security.Permission;
import java.security.PrivilegedExceptionAction;
import java.security.AccessControlContext;
import java.security.PrivilegedActionException;
import java.security.AccessControlException;
import java.security.PrivilegedAction;

/*
 * MJI model class for java.security.AccessController library abstraction
 */
public class AccessController {
  public static void checkPermission (Permission p) throws AccessControlException {
  }
  
  public static <T> T doPrivileged (PrivilegedAction<T> action,
                                     AccessControlContext context) {
    return action.run();
  }
  
  public static <T> T doPrivileged (PrivilegedAction<T> action)  {
    return action.run();
  }
  
  public static <T> T doPrivileged (PrivilegedExceptionAction<T> action,
                                     AccessControlContext context)
    throws PrivilegedActionException {

    try {
      return action.run();
      
    } catch (RuntimeException rx){
      throw rx; // we have to let unchecked exceptions pass
    } catch (Exception x) {
      throw new PrivilegedActionException(x);
    }
  }
  
  public static <T> T doPrivileged (PrivilegedExceptionAction<T> action)
    throws PrivilegedActionException {

    try {
      return action.run();

    } catch (RuntimeException rx){
      throw rx; // we have to let unchecked exceptions pass
    } catch (Exception x) {
      throw new PrivilegedActionException(x);
    }
  }
  
  public static AccessControlContext getContext() {
    return null;
  }
  
  @SuppressWarnings("unused")
  private static AccessControlContext getStackAccessControlContext() {
    return null;
  }

  static AccessControlContext getInheritedAccessControlContext() {
    return null;
  }

}

